Why are we in to sharing our wife's? Dirty, kinky, tabu,, imagination, result of ...... in young age, fantasy and for some size matters, others hurt by being done by a big dick, and pain is a turn on for some as well, Make a pick. A perfect penis is very individual for each and one lady. My experience 15 years active with at least 10 new women a year, and 5 shorter relationships, less than one year, 3 longer relationships, and two marriages.
For some psychological, some physical, others fantasizing. Why do some men come stronger when we have been played and made jealous.
Some of your wife's enjoy making you jealous with a bigger cock, and that's the thrill? I guess to many variables than just a big black cock. Well I enjoy my wife's Asian pussy, and still I do not find her different from any white pussy I had.